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<div id="overview"><a href="../../../../../apidocs/com/googlecode/ehcache/annotations/RefreshingSelfPopulatingCache.html">View Javadoc</a></div><pre>

<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_javadoccomment"> * Copyright 2010-2011 Nicholas Blair, Eric Dalquist</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_javadoccomment"> * Licensed under the Apache License, Version 2.0 (the "License");</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_javadoccomment"> * you may not use this file except in compliance with the License.</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_javadoccomment"> * You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_javadoccomment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_javadoccomment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_javadoccomment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_javadoccomment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_javadoccomment"> * See the License for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_javadoccomment"> * limitations under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> com.googlecode.ehcache.annotations;
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> java.io.Serializable;
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.util.Timer;
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.ConcurrentMap;
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.Executor;
<a class="jxr_linenumber" name="22" href="#22">22</a>  
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> net.sf.ehcache.CacheException;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> net.sf.ehcache.Ehcache;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> net.sf.ehcache.Element;
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> net.sf.ehcache.Status;
<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> net.sf.ehcache.constructs.blocking.CacheEntryFactory;
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> net.sf.ehcache.constructs.blocking.SelfPopulatingCache;
<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> net.sf.ehcache.event.CacheManagerEventListener;
<a class="jxr_linenumber" name="30" href="#30">30</a>  
<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> org.slf4j.Logger;
<a class="jxr_linenumber" name="32" href="#32">32</a>  <strong class="jxr_keyword">import</strong> org.slf4j.LoggerFactory;
<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> org.springframework.core.task.TaskExecutor;
<a class="jxr_linenumber" name="34" href="#34">34</a>  
<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">import</strong> com.google.common.collect.MapMaker;
<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> com.googlecode.ehcache.annotations.support.TaskSchedulerAdapter;
<a class="jxr_linenumber" name="37" href="#37">37</a>  <strong class="jxr_keyword">import</strong> com.googlecode.ehcache.annotations.support.TimerTaskSchedulerAdapter;
<a class="jxr_linenumber" name="38" href="#38">38</a>  
<a class="jxr_linenumber" name="39" href="#39">39</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> * Extension of SelfPopulatingCache that schedules a periodic call of {@link #refresh()} via the specified</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> * {@link TaskSchedulerAdapter}. Also overrides {@link #refreshElement(Element, Ehcache, boolean)} to allow for</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> * asynchronous refresh of elements iff an {@link Executor} was provided to the constructor.</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../com/googlecode/ehcache/annotations/RefreshingSelfPopulatingCache.html">RefreshingSelfPopulatingCache</a> <strong class="jxr_keyword">extends</strong> SelfPopulatingCache {
<a class="jxr_linenumber" name="45" href="#45">45</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">final</strong> Logger logger = LoggerFactory.getLogger(<strong class="jxr_keyword">this</strong>.getClass());
<a class="jxr_linenumber" name="46" href="#46">46</a>      
<a class="jxr_linenumber" name="47" href="#47">47</a>      <em class="jxr_comment">//Use a weak key concurrent map to track async refreshes without danger of memory leaks</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> ConcurrentMap&lt;Serializable, Long&gt; refreshQueue = <strong class="jxr_keyword">new</strong> MapMaker().weakKeys().makeMap();
<a class="jxr_linenumber" name="49" href="#49">49</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../com/googlecode/ehcache/annotations/support/TaskSchedulerAdapter.html">TaskSchedulerAdapter</a> scheduler;
<a class="jxr_linenumber" name="50" href="#50">50</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> TaskExecutor executer;
<a class="jxr_linenumber" name="51" href="#51">51</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> refreshInterval;
<a class="jxr_linenumber" name="52" href="#52">52</a>      
<a class="jxr_linenumber" name="53" href="#53">53</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../com/googlecode/ehcache/annotations/RefreshingSelfPopulatingCache.html">RefreshingSelfPopulatingCache</a>(Ehcache cache, CacheEntryFactory cacheEntryFactory,
<a class="jxr_linenumber" name="54" href="#54">54</a>              <a href="../../../../com/googlecode/ehcache/annotations/support/TaskSchedulerAdapter.html">TaskSchedulerAdapter</a> scheduler, TaskExecutor executer,
<a class="jxr_linenumber" name="55" href="#55">55</a>              <strong class="jxr_keyword">long</strong> refreshInterval) {
<a class="jxr_linenumber" name="56" href="#56">56</a>          <strong class="jxr_keyword">super</strong>(cache, cacheEntryFactory);
<a class="jxr_linenumber" name="57" href="#57">57</a>          
<a class="jxr_linenumber" name="58" href="#58">58</a>          <strong class="jxr_keyword">final</strong> Timer timer;
<a class="jxr_linenumber" name="59" href="#59">59</a>          <strong class="jxr_keyword">if</strong> (scheduler == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="60" href="#60">60</a>              timer = <strong class="jxr_keyword">new</strong> Timer(cache.getName() + <span class="jxr_string">" Cache Refresh Timer"</span>, <strong class="jxr_keyword">true</strong>);
<a class="jxr_linenumber" name="61" href="#61">61</a>              <strong class="jxr_keyword">this</strong>.scheduler = <strong class="jxr_keyword">new</strong> <a href="../../../../com/googlecode/ehcache/annotations/support/TimerTaskSchedulerAdapter.html">TimerTaskSchedulerAdapter</a>(timer);
<a class="jxr_linenumber" name="62" href="#62">62</a>          }
<a class="jxr_linenumber" name="63" href="#63">63</a>          <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="64" href="#64">64</a>              timer = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="65" href="#65">65</a>              <strong class="jxr_keyword">this</strong>.scheduler = scheduler;
<a class="jxr_linenumber" name="66" href="#66">66</a>          }
<a class="jxr_linenumber" name="67" href="#67">67</a>          
<a class="jxr_linenumber" name="68" href="#68">68</a>          <strong class="jxr_keyword">this</strong>.executer = executer;
<a class="jxr_linenumber" name="69" href="#69">69</a>          <strong class="jxr_keyword">this</strong>.refreshInterval = refreshInterval;
<a class="jxr_linenumber" name="70" href="#70">70</a>          
<a class="jxr_linenumber" name="71" href="#71">71</a>          <strong class="jxr_keyword">this</strong>.scheduleRefreshTask();
<a class="jxr_linenumber" name="72" href="#72">72</a>          
<a class="jxr_linenumber" name="73" href="#73">73</a>          <em class="jxr_comment">//Register a listener with the cache manager to make sure we clear out our timer thread cleanly</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>          <strong class="jxr_keyword">this</strong>.getCacheManager().setCacheManagerEventListener(<strong class="jxr_keyword">new</strong> CacheManagerEventListener() {
<a class="jxr_linenumber" name="75" href="#75">75</a>              <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> notifyCacheRemoved(String cacheName) {
<a class="jxr_linenumber" name="76" href="#76">76</a>              }
<a class="jxr_linenumber" name="77" href="#77">77</a>              <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> notifyCacheAdded(String cacheName) {
<a class="jxr_linenumber" name="78" href="#78">78</a>              }
<a class="jxr_linenumber" name="79" href="#79">79</a>              <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> init() <strong class="jxr_keyword">throws</strong> CacheException {
<a class="jxr_linenumber" name="80" href="#80">80</a>              }
<a class="jxr_linenumber" name="81" href="#81">81</a>              <strong class="jxr_keyword">public</strong> Status getStatus() {
<a class="jxr_linenumber" name="82" href="#82">82</a>                  <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="83" href="#83">83</a>              }
<a class="jxr_linenumber" name="84" href="#84">84</a>              <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> dispose() <strong class="jxr_keyword">throws</strong> CacheException {
<a class="jxr_linenumber" name="85" href="#85">85</a>                  <strong class="jxr_keyword">if</strong> (timer != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="86" href="#86">86</a>                      timer.cancel();
<a class="jxr_linenumber" name="87" href="#87">87</a>                  }
<a class="jxr_linenumber" name="88" href="#88">88</a>              }
<a class="jxr_linenumber" name="89" href="#89">89</a>          });
<a class="jxr_linenumber" name="90" href="#90">90</a>      }
<a class="jxr_linenumber" name="91" href="#91">91</a>      
<a class="jxr_linenumber" name="92" href="#92">92</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">long</strong> getRefreshInterval() {
<a class="jxr_linenumber" name="93" href="#93">93</a>          <strong class="jxr_keyword">return</strong> refreshInterval;
<a class="jxr_linenumber" name="94" href="#94">94</a>      }
<a class="jxr_linenumber" name="95" href="#95">95</a>  
<a class="jxr_linenumber" name="96" href="#96">96</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> scheduleRefreshTask() {
<a class="jxr_linenumber" name="97" href="#97">97</a>          scheduler.scheduleAtFixedRate(<strong class="jxr_keyword">new</strong> Runnable() {
<a class="jxr_linenumber" name="98" href="#98">98</a>              <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run() {
<a class="jxr_linenumber" name="99" href="#99">99</a>                  <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="100" href="#100">100</a>                     refresh();
<a class="jxr_linenumber" name="101" href="#101">101</a>                 }
<a class="jxr_linenumber" name="102" href="#102">102</a>                 <strong class="jxr_keyword">catch</strong> (Throwable t) {
<a class="jxr_linenumber" name="103" href="#103">103</a>                     logger.error(<span class="jxr_string">"An exception was thrown while refreshing the cache. Review the previous log statements for errors related to individual cache entries."</span>, t);
<a class="jxr_linenumber" name="104" href="#104">104</a>                 }
<a class="jxr_linenumber" name="105" href="#105">105</a>             }
<a class="jxr_linenumber" name="106" href="#106">106</a>         }, refreshInterval);
<a class="jxr_linenumber" name="107" href="#107">107</a>     }
<a class="jxr_linenumber" name="108" href="#108">108</a> 
<a class="jxr_linenumber" name="109" href="#109">109</a>     @Override
<a class="jxr_linenumber" name="110" href="#110">110</a>     <strong class="jxr_keyword">protected</strong> Element refreshElement(<strong class="jxr_keyword">final</strong> Element element, <strong class="jxr_keyword">final</strong> Ehcache backingCache, <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">boolean</strong> quiet) <strong class="jxr_keyword">throws</strong> Exception {
<a class="jxr_linenumber" name="111" href="#111">111</a>         <strong class="jxr_keyword">final</strong> Serializable key = element.getKey();
<a class="jxr_linenumber" name="112" href="#112">112</a>         
<a class="jxr_linenumber" name="113" href="#113">113</a>         <em class="jxr_comment">//For refresh track that the element is being refreshed so we don't queue up multiple refresh attempts</em>
<a class="jxr_linenumber" name="114" href="#114">114</a>         <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> now = System.currentTimeMillis();
<a class="jxr_linenumber" name="115" href="#115">115</a>         <strong class="jxr_keyword">final</strong> Long existingRefreshStart = <strong class="jxr_keyword">this</strong>.refreshQueue.putIfAbsent(key, now);
<a class="jxr_linenumber" name="116" href="#116">116</a>         <strong class="jxr_keyword">if</strong> (existingRefreshStart != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="117" href="#117">117</a>             <strong class="jxr_keyword">this</strong>.logger.warn(<span class="jxr_string">"Key {} in cache {} is already being refreshed started {}ms ago, it will be skipped for this refresh iteration."</span>, <strong class="jxr_keyword">new</strong> Object[] { key, backingCache.getName(), now - existingRefreshStart });
<a class="jxr_linenumber" name="118" href="#118">118</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="119" href="#119">119</a>         }
<a class="jxr_linenumber" name="120" href="#120">120</a> 
<a class="jxr_linenumber" name="121" href="#121">121</a>         <strong class="jxr_keyword">boolean</strong> clearRefreshFlag = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="122" href="#122">122</a>         <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="123" href="#123">123</a>             <strong class="jxr_keyword">if</strong> (element.isExpired()) {
<a class="jxr_linenumber" name="124" href="#124">124</a>                 <strong class="jxr_keyword">this</strong>.logger.debug(<span class="jxr_string">"Element for key {} has expired, this key will not be refreshed"</span>, key);
<a class="jxr_linenumber" name="125" href="#125">125</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="126" href="#126">126</a>             }
<a class="jxr_linenumber" name="127" href="#127">127</a> 
<a class="jxr_linenumber" name="128" href="#128">128</a>             <em class="jxr_comment">//Check if the element is old enough to try refreshing it</em>
<a class="jxr_linenumber" name="129" href="#129">129</a>             <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> age = now - element.getLatestOfCreationAndUpdateTime();
<a class="jxr_linenumber" name="130" href="#130">130</a>             <strong class="jxr_keyword">if</strong> (age &lt; refreshInterval) {
<a class="jxr_linenumber" name="131" href="#131">131</a>                 <strong class="jxr_keyword">this</strong>.logger.debug(<span class="jxr_string">"Element for key {} is only {}ms old and will not be refreshed. Refresh age is {}"</span>, <strong class="jxr_keyword">new</strong> Object[] { key, age, refreshInterval });
<a class="jxr_linenumber" name="132" href="#132">132</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="133" href="#133">133</a>             }
<a class="jxr_linenumber" name="134" href="#134">134</a>             
<a class="jxr_linenumber" name="135" href="#135">135</a>             <strong class="jxr_keyword">final</strong> Object value = element.getObjectValue();
<a class="jxr_linenumber" name="136" href="#136">136</a>             <strong class="jxr_keyword">if</strong> (!(value instanceof RefreshableCacheEntry)) {
<a class="jxr_linenumber" name="137" href="#137">137</a>                 <strong class="jxr_keyword">this</strong>.logger.warn(<span class="jxr_string">"RefreshingSelfPopulatingCache contains an entry which is not a RefreshableCacheEntry for key {} this entry will be ignored during refresh."</span>, key);
<a class="jxr_linenumber" name="138" href="#138">138</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="139" href="#139">139</a>             }
<a class="jxr_linenumber" name="140" href="#140">140</a>             
<a class="jxr_linenumber" name="141" href="#141">141</a>             <em class="jxr_comment">//If no executor refresh synchronously</em>
<a class="jxr_linenumber" name="142" href="#142">142</a>             <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.executer == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="143" href="#143">143</a>                 <strong class="jxr_keyword">super</strong>.refreshElement(element, backingCache, quiet);
<a class="jxr_linenumber" name="144" href="#144">144</a>             }
<a class="jxr_linenumber" name="145" href="#145">145</a>             <em class="jxr_comment">//If executor refresh via thread-pool</em>
<a class="jxr_linenumber" name="146" href="#146">146</a>             <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="147" href="#147">147</a>                 clearRefreshFlag = false;
<a class="jxr_linenumber" name="148" href="#148">148</a>                 <em class="jxr_comment">//Submit the refresh task to the executor</em>
<a class="jxr_linenumber" name="149" href="#149">149</a>                 executer.execute(<strong class="jxr_keyword">new</strong> Runnable() {
<a class="jxr_linenumber" name="150" href="#150">150</a>                     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run() {
<a class="jxr_linenumber" name="151" href="#151">151</a>                         <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="152" href="#152">152</a>                             RefreshingSelfPopulatingCache.<strong class="jxr_keyword">super</strong>.refreshElement(element, backingCache, quiet);
<a class="jxr_linenumber" name="153" href="#153">153</a>                         }
<a class="jxr_linenumber" name="154" href="#154">154</a>                         <strong class="jxr_keyword">catch</strong> (Throwable e) {
<a class="jxr_linenumber" name="155" href="#155">155</a>                             logger.error(<span class="jxr_string">"An exception was thrown while refreshing the ca"</span>, e);
<a class="jxr_linenumber" name="156" href="#156">156</a>                         }
<a class="jxr_linenumber" name="157" href="#157">157</a>                         <strong class="jxr_keyword">finally</strong> {
<a class="jxr_linenumber" name="158" href="#158">158</a>                             <em class="jxr_comment">//Clear out the refresh tracker reference</em>
<a class="jxr_linenumber" name="159" href="#159">159</a>                             refreshQueue.remove(key);
<a class="jxr_linenumber" name="160" href="#160">160</a>                         }
<a class="jxr_linenumber" name="161" href="#161">161</a>                     }
<a class="jxr_linenumber" name="162" href="#162">162</a>                 });
<a class="jxr_linenumber" name="163" href="#163">163</a>             }
<a class="jxr_linenumber" name="164" href="#164">164</a>         }
<a class="jxr_linenumber" name="165" href="#165">165</a>         <strong class="jxr_keyword">catch</strong> (<strong class="jxr_keyword">final</strong> Exception e) {
<a class="jxr_linenumber" name="166" href="#166">166</a>             <strong class="jxr_keyword">this</strong>.logger.warn(<span class="jxr_string">"An exception was thrown while refreshing the cache for "</span> + element + <span class="jxr_string">". This element may not have been refreshed"</span>, e);
<a class="jxr_linenumber" name="167" href="#167">167</a>         }
<a class="jxr_linenumber" name="168" href="#168">168</a>         <strong class="jxr_keyword">finally</strong> {
<a class="jxr_linenumber" name="169" href="#169">169</a>             <em class="jxr_comment">//Clear out the refresh tracker reference if sync refresh was done</em>
<a class="jxr_linenumber" name="170" href="#170">170</a>             <strong class="jxr_keyword">if</strong> (clearRefreshFlag) {
<a class="jxr_linenumber" name="171" href="#171">171</a>                 refreshQueue.remove(key);
<a class="jxr_linenumber" name="172" href="#172">172</a>             }
<a class="jxr_linenumber" name="173" href="#173">173</a>         }
<a class="jxr_linenumber" name="174" href="#174">174</a>         
<a class="jxr_linenumber" name="175" href="#175">175</a>         <strong class="jxr_keyword">return</strong> element;
<a class="jxr_linenumber" name="176" href="#176">176</a>     }
<a class="jxr_linenumber" name="177" href="#177">177</a> }
</pre>
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